Improvement in steam-valves



UNITED SrAfrEs PATENT EErcE.

IMPROVEMENT IN STEAM-VA LVES.

Specification forming part of Letters Patent No. 54,129, dated April 24,1866.

To all whom it may concern Be it known that I, THOMAS B. DEXTER, ofLynn, in the county of Essex and State of Massachusetts, have inventedcertain new and useful Improvements in Globe-Valves 5 and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had t0 the accompanying drawing, inaking partof this specification, and to the letters of reference marked thereon,like letters indicating like parts wherever they occur.

To enable others skilled in the art to construct and use the invention,I will proceed to describe it.

My invention relates to that class of valves denominated `globe-valves 5and it consists in so constructing it that the valve may be ground toits seat without removing it, and also in so constructing the parts thatthe stem of the valve may be packed without shutting off the steam fromthe globe or valve.

A represents the globe or shell having the diaphragm a, with thevalve-seat, constructed in the usual manner.

E represents the valve, which is fitted to its seat as usual, and havinga stem, B, which passes through a hub or col-lar, D, which screws intothe side of the shell, as shown in Fig. 1. To the outer end of thiscollar D is screwed a sleeve, G, having a screw-thread cutl on itsinterior surface corresponding with a similar thread on the stem B, ahand-wheel, H, being secured to the outer end ofthe stem for oper atingit, as usual. The lower end of the sleeve C is provided with an annularrecess surrounding the stem B, on which latter is placed a collar orring, n, for the purpose of packing the stem and preventing the escapeot' steam.

It will be observed that the valve E is provided witha conical hub onits upper side surrounding the stemB, and that acorresponding recess, o,is made in the inner end of hub D, so that by unscrewing the sleeve Cand drawing the stem B back the conical hub of valve E will lit into therecess o and prevent the escape of steam around the stem while it g isbeing packed at the upper end of D, thereby saving the necessity ofshutting o the steam in order to pack the stein B.

As ordinarily constructed, it is necessary when the valve becomes wornso as to leak steam to detach it from the pipes in order to grind thevalve to its seat again and make it tight. In order to obviate thisnecessityI tap a hole into the shell on each side and till them with ascrew, as shown at m of Fig. 2. These holes are so located that nomatter in what position the shell A may stand, whether attached to ahorizontal or vertical pipe, one of said holes will always be in aproper position to admit emery and o il to be inserted through it ontothe valve-seat. 1f the shell is attached to a vertical pipe one of theholes will be above the center whichever end up the shell may be, and ifattached to a horizontal pipe one ot the holes will always be on theupper side. By these means the emery and oil can always be insertedwithout removing the valve or the hub D, it only being required tounscrew the sleeve C, so as to turn the stem in grinding the valve andfitting it to its seat.

In order to guide the valve accurately to its seat a bracket, b, is caston the inside of the shell, directly under the lower end of the stem. Ahole is bored in this bracket b to receive the small projecting stem e,which is but a continuation of the main stem B, as shown in Fig. l. Ifdesired, however, this may be dispensed with, as the stem B is guidedboth by its bearing in the sleeve C and also in the hub D.

Having thus described myinvention, what I claim is- The shell A,provided with the openings and plugs m, for the purpose of introducingmaterial and enabling the valve to be ground to its seat withoutremoving the hub D or other parts, as set forth.

THOMAS B. DEXTER.

Witnesses: s

W. C. DODGE, R. E. ELLEEBEGK.

